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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity Method Investments And Joint Ventures [Abstract]    
Revenue $ 365,125 $ 343,199
Operating income 94,621 136,208
Net income $ 48,928 $ 93,996